ANDKOIHKiONE.E. 63 



Eacemes solitary, 1-sided at the apex of the culm or its branches. 

 One to fifteen of the lower pairs of spikelets homogamoas, the 

 staminate or neuter awnless. The perfect pistillate spikelets sub- 

 cylindrical, awned, first glume hard, iuvolute, second awnless, 

 obscurely keeled, third hyaline, fourth narrow at the base, bearing 

 a protruding awn, the twisted portion of which is clothed with short 

 rufous or white hairs; palea or minute. Grain linear-oblong or 

 oblong, obcompressed ; embryo extending beyond the middle. 

 Pedicellate s]3ikelets awnless, staminate or neuter, culms com- 

 pressed. Leaf- blades usually narrow. 



These grasses are widely distributed over warm regions of Eu- 

 rope, Asia, Africa, Australia, and North America. 



31. A. melanocarpus Ell. Bot. S. C. and Ga. 1 : 146 (1816). 

 IStipa melanocaiya Mulil. Gram. 183 (1817). Cyiiibopogon melano- 

 carpus Spreng. Syst. 1 : 289 (1824). Trachypoyon scrobiculatus 

 Xees, Agrost. Braz. 347 (1829). Hcteropoyon acuminatus Trin. 

 Mem. Acad. St. Petersb. (VI.) 2 : 254 (1833). Andropoyon scro- 

 Mculatus Kunth, Enum. 1 : 507 (1833). 



Annual; culms 0.5-2 m. high, very smooth, much branched 

 above, the spikes nearly covered by the sheaths. Sheaths subcom- 

 pressed, very smooth, loose, the highest with no blade or a very 

 short one ; ligule 1-4 mm. long, smooth at the apex, round ; the 

 lower blades flat, 15-40 cm. long, 0.5-1 cm. wide, the base rather nar- 

 rower, the apex long-pointed, margins scabrous. Eacemes within 

 the spathes borne on short pedicels, erect, slightly compressed, 

 4-6 cm. long, besides the awns. Pistillate or perfect spikelets 7-9 

 mm. long, on a callus 3 mm. long, clothed with appressed, rusty, 

 brown hairs, first glume obscurely 9-nerved. 6 mm. long, fourth 

 glume bearing a bent awn, 8-12 cm. long, shortly and softly pubes- 

 cent with brown hairs ; palea 0. Ovary oblong, with two points, 

 the staminate or neuter spikelets pedicellate, slightly sigmoid, lan- 

 ceolate-acuminate, 16-20 mm. long; first glume herbaceous, smooth 

 except the infolded margins, 17-21-nerved, second a third or fourth 

 shorter, lanceolate, 3-nerved, very acute, third 1-nerved, 8 mm. 

 long, fourth very short, hyaline ; palea 0. Anthers 4 mm. long, 

 sometimes 0. Widely dispersed. Florida, Curtiss 3641, A. P. 



